/* * Audio support data for ISDN4Linux. * * Copyright 2002/2003 by Andreas Eversberg (jolly@eversberg.eu) * * This software may be used and distributed according to the terms * of the GNU General Public License, incorporated herein by reference. *
*/
#define MAX_POLL 256 /* maximum number of send-chunks */
#define CMX_BUFF_SIZE 0x8000 /* must be 2**n (0x1000 about 1/2 second) */ #define CMX_BUFF_HALF 0x4000 /* CMX_BUFF_SIZE / 2 */ #define CMX_BUFF_MASK 0x7fff /* CMX_BUFF_SIZE - 1 */
/* how many seconds will we check the lowest delay until the jitter buffer
is reduced by that delay */ #define MAX_SECONDS_JITTER_CHECK 5
externstruct timer_list dsp_spl_tl;
/* the datatype need to match jiffies datatype */ externunsignedlong dsp_spl_jiffies;
/* the structure of conferences: * * each conference has a unique number, given by user space. * the conferences are linked in a chain. * each conference has members linked in a chain. * each dsplayer points to a member, each member points to a dsplayer.
*/
/* all members within a conference (this is linked 1:1 with the dsp) */ struct dsp; struct dsp_conf_member { struct list_head list; struct dsp *dsp;
};
/* the list of all conferences */ struct dsp_conf { struct list_head list;
u32 id; /* all cmx stacks with the same ID are
connected */ struct list_head mlist; int software; /* conf is processed by software */ int hardware; /* conf is processed by hardware */ /* note: if both unset, has only one member */
};
/************** * DTMF stuff *
**************/
#define DSP_DTMF_NPOINTS 102
#define ECHOCAN_BUFF_SIZE 0x400 /* must be 2**n */ #define ECHOCAN_BUFF_MASK 0x3ff /* -1 */
struct dsp_dtmf { int enable; /* dtmf is enabled */ int treshold; /* above this is dtmf (square of) */ int software; /* dtmf uses software decoding */ int hardware; /* dtmf uses hardware decoding */ int size; /* number of bytes in buffer */ signedshort buffer[DSP_DTMF_NPOINTS]; /* buffers one full dtmf frame */
u8 lastwhat, lastdigit; int count;
u8 digits[16]; /* dtmf result */
};
struct dsp_tone { int software; /* tones are generated by software */ int hardware; /* tones are generated by hardware */ int tone; void *pattern; int count; int index; struct timer_list tl;
};
/*************** * echo stuff *
***************/
struct dsp_echo { int software; /* echo is generated by software */ int hardware; /* echo is generated by hardware */
};
/***************** * general stuff *
*****************/
struct dsp { struct list_head list; struct mISDNchannel ch; struct mISDNchannel *up; unsignedchar name[64]; int b_active; struct dsp_echo echo; int rx_disabled; /* what the user wants */ int rx_is_off; /* what the card is */ int tx_mix; struct dsp_tone tone; struct dsp_dtmf dtmf; int tx_volume, rx_volume;
/* queue for sending frames */ struct work_struct workq; struct sk_buff_head sendq; int hdlc; /* if mode is hdlc */ int data_pending; /* currently an unconfirmed frame */
/* buffer stuff */ int rx_W; /* current write pos for data without timestamp */ int rx_R; /* current read pos for transmit clock */ int rx_init; /* if set, pointers will be adjusted first */ int tx_W; /* current write pos for transmit data */ int tx_R; /* current read pos for transmit clock */ int rx_delay[MAX_SECONDS_JITTER_CHECK]; int tx_delay[MAX_SECONDS_JITTER_CHECK];
u8 tx_buff[CMX_BUFF_SIZE];
u8 rx_buff[CMX_BUFF_SIZE]; int last_tx; /* if set, we transmitted last poll interval */ int cmx_delay; /* initial delay of buffers,
or 0 for dynamic jitter buffer */ int tx_dejitter; /* if set, dejitter tx buffer */ int tx_data; /* enables tx-data of CMX to upper layer */
/* hardware stuff */ struct dsp_features features; int features_rx_off; /* set if rx_off is featured */ int features_fill_empty; /* set if fill_empty is featured */ int pcm_slot_rx; /* current PCM slot (or -1) */ int pcm_bank_rx; int pcm_slot_tx; int pcm_bank_tx; int hfc_conf; /* unique id of current conference (or -1) */
/* encryption stuff */ int bf_enable;
u32 bf_p[18];
u32 bf_s[1024]; int bf_crypt_pos;
u8 bf_data_in[9];
u8 bf_crypt_out[9]; int bf_decrypt_in_pos; int bf_decrypt_out_pos;
u8 bf_crypt_inring[16];
u8 bf_data_out[9]; int bf_sync;
struct dsp_pipeline
pipeline;
};
/* functions */
externvoid dsp_change_volume(struct sk_buff *skb, int volume);
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